A theme coordinates a set of colors, fonts, and special effects that are applied to objects in your worksheet. Excel 2013 includes a number of new themes that bring together designer color schemes, font families, and special effects. By default, the Office theme is applied to any new blank workbooks that you create, but you can use the Themes tool on the Page Layout tab to choose another theme for your workbook.
In an open Excel workbook, on the ribbon, click the Page Layout tab.
In the Themes group, click Themes.
Select the theme that you want to apply.
Click the ...